The fix seems to be working as intended (Destiny)

by Korny , Dalton, Ga. US. Earth, Sol System, Friday, September 25, 2015, 17:03 (3443 days ago) @ Kahzgul

The whole point is to mitigate the effectiveness of farming. You can blast through some Strikes pretty damn fast, so that’s not necessarily a good measure.

I had used two Three of Coins before yesterday’s patch and I used two Three of Coins this morning while in the Court of Oryx (Level 3). I netted an exotic chest piece on the second coin. We’ll see how many more before my next one, but the math is holding steady for now.

I don't argue that farming needed mitigation, I'm arguing that the implementation of this fix could have been better. More transparent, more clear, less likely to cause people to waste coins.

That's the thing of it, though.

Don't want to risk wasting coins? Use them less often.
That means you dip into the gamble less often (you may usually forget about the coins), which means you get free rewards less often.
The odds may be the same, but the rate at which to play them is greatly reduced. Otherwise, folks would just run Draxis, slap a countdown timer on, then as soon as it buzzed, they'd drop out of whatever activity, and run it again. You decrease the rate, but don't really fix anything.

The ambiguity has a few benefits for Bungie slowing the rate at which folks get exotics, while still giving them the chance at rewards for running stuff like Nightfalls multiple times...